I've seen posts making fun of Israel for being so weak and desperate that even people in their 90s are called to the army. Such people simply don't get the volunteer can do ethos of Israel.

In the Mishnah we are told that in a time of milhemet mitzva, a war of no choice, an existential threat, even the bride and groom leave their wedding ceremony to defend the country.

בְּמִלְחֶמֶת חוֹבָה, הַכֹּל יוֹצְאִין,
אֲפִלּוּ חָתָן מֵחֶדְרוֹ וְכַלָּה מֵחֻפָּתָהּ:

This is derived from a verse in the biblical book of Joel describing how all the nation from the elderly to the nursing infants and the bride and groom from their wedding canopy come together in prayer and repentance in time of crisis, so that Hashem will restore Israel's security, both in terms of rain at its appointed time so that the crops will grow, and by removing the threats of enemy powers from Israel's borders.

טו תִּקְע֥וּ שׁוֹפָ֖ר בְּצִיּ֑וֹן קַדְּשׁוּ־צ֖וֹם קִרְא֥וּ עֲצָרָֽה׃ טז אִסְפוּ־עָ֞ם קַדְּשׁ֤וּ קָהָל֙ קִבְצ֣וּ זְקֵנִ֔ים אִסְפוּ֙ עֽוֹלָלִ֔ים וְיֹֽנְקֵ֖י שָׁדָ֑יִם יֵצֵ֤א חָתָן֙ מֵֽחֶדְר֔וֹ וְכַלָּ֖ה מֵֽחֻפָּתָֽהּ׃ יז בֵּ֤ין הָֽאוּלָם֙ וְלַמִּזְבֵּ֔חַ יִבְכּוּ֙ הַכֹּ֣הֲנִ֔ים מְשָֽׁרְתֵ֖י יְהוָ֑ה וְֽיֹאמְר֞וּ ח֧וּסָה יְהוָ֣ה עַל־עַמֶּ֗ךָ וְאַל־תִּתֵּ֨ן נַחֲלָֽתְךָ֤ לְחֶרְפָּה֙ לִמְשָׁל־בָּ֣ם גּוֹיִ֔ם לָ֚מָּה יֹֽאמְר֣וּ בָֽעַמִּ֔ים אַיֵּ֖ה אֱלֹֽהֵיהֶֽם׃ יח וַיְקַנֵּ֥א יְהוָ֖ה לְאַרְצ֑וֹ וַיַּחְמֹ֖ל עַל־עַמּֽוֹ׃ יט וַיַּ֨עַן יְהוָ֜ה וַיֹּ֣אמֶר לְעַמּ֗וֹ הִנְנִ֨י שֹׁלֵ֤חַ לָכֶם֙ אֶת־הַדָּגָן֙ וְהַתִּיר֣וֹשׁ וְהַיִּצְהָ֔ר וּשְׂבַעְתֶּ֖ם אֹת֑וֹ וְלֹֽא־אֶתֵּ֨ן אֶתְכֶ֥ם ע֛וֹד חֶרְפָּ֖ה בַּגּוֹיִֽם׃ כ וְֽאֶת־הַצְּפוֹנִ֞י אַרְחִ֣יק מֵֽעֲלֵיכֶ֗ם וְהִדַּחְתִּיו֮ אֶל־אֶ֣רֶץ צִיָּ֣ה וּשְׁמָמָה֒ אֶת־פָּנָ֗יו אֶל־הַיָּם֙ הַקַּדְמֹנִ֔י וְסֹפ֖וֹ אֶל־הַיָּ֣ם הָאַֽחֲר֑וֹן

95 year-old Ezra Yakhin "Elnakam", the oldest reservist in the IDF, was a comrade of my Jason's great-uncle in the Lehi underground in the 1940s, before the founding of the State of Israel. In those most desperate times for the Jewish people they fought for the survival of the Jewish people against all odds. All these years later that sense of duty to defend our people is very much at the core of Ezra Yakhin's ethos.

Yakhin, along with 87 year-old Martin Holt and 85 year-old Nacha Gilboa are old enough to remember the horrors of the 1940s and the determination of every Jew to ensure the survival of our people in our homeland and in the world in general.

They continue to volunteer for reserve duty to remind the younger generations that we have faced such existential threats and barbaric attacks before, and survived to rebuild and restore. Am Yisrael Hai.